yo can some one give me a few tips on beetin the penthouse mission. i keep gettin spoted

The secret to this mission is timing...Go through the lower door and procede to the double glass doors on the lower level. Crouch down and open the doors. Procede to the end of the hall and go left, turn left again and you will see the living room with a man in front of the tv. Very slowly procede along the right side of the corridor. When you reach the end stop, turn left and aim your gun site at the left side of the stairs, then very slowly walk towards the stairs. As long as you don't hesitate or make too much noise the guy will not see you go up the stairs and turn left to go up the second set. Get as close to the wall as you can and stay crouched their at the bottom of the second set of stairs. Watch your map and eventually you will see a tango appear. Wait until he leaves your screen and quitely go up the stairs, go straight towards your right and turn left again (only way you can go) and proceed to the end of the hall the phone is in the room to your left. Bug it and then turn and go towards the west wall. Stay crouched and wait for a tango to appear on your map, you can peek to your left the opening and you will see him pass you and go down the hall. AS SOON AS HE DOES follow him, (this part is critical) Follow him down the hall, don't worry that he will see you , he wont! When he turns right at the end of the hall he will stop briefly, wait there until he starts to move again, as you turn the corner you will see him turning at the end of the hall. GO straight... to your left the hall splits and you will see double glass doors. As you approach the doors, you will be told that the office is occupied. There will be a tango with his back to you, tiptoe (crouched all the time) down the hall and to the left. Go up stairs and you will hit a checkpoint. whew! Ok now you will see a dot on your map, another tango, wait for him to leave and turn right down the hall. The hall comes to a TEE. To your left you will see a tango with his back to you, ignore him, turn left and you will see a door on your left hand side. This is the master bedroom (almost there) open the door and tiptoe to your left past the tango with his back to you. Bear left around the partition and you will see a computer. Hack the computer and guess what? You get too use your gun again. Now you can get all your frustration out from the hours you wasted figuring out this level. Waste everybody on the second level before going downstairs to the glass doors to get the accountant. Remember where you saw tangos on your way up... they will be there to greet you on your way down...

if your having trouble here ..you will love the airport mission

i am still stuck on this level

I just beat it today after about 100 tries.

please help me find a way to play four people on splitscreen please we want to have fun lol